info/examples/tip/outpsel.tip


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% This macro source file is from the four volume series
% "TeX in Practice" by Stephan von Bechtolsheim, published
% 1993 by Springer-Verlag, New York.
% Copyright 1993 Stephan von Bechtolsheim.
% No warranty or liability is assumed.
% This macro may be copied freely if no fees other than
% media cost or shipping charges are charged and as long
% as this copyright and the following source code itself
% is not changed. Please see the series for further information.
%
% Version: 1.0
% Date: May 1, 1993
%
%
% This source code is documented in 34.2, p. IV-58.
% Original source in file "o1.TEX", starting line 75.
\wlog{L: "outpsel.tip" ["o1.TEX," l. 75, p. IV-58]}%
% This file DOES NOT belong to format "texip."
\newcount\FirstPageNo           \FirstPageNo = -100000
\newcount\LastPageNo            \LastPageNo =   100000
\output = {%
    \global\deadcycles = 0
    \ifnum\pageno < \FirstPageNo
        \setbox 255 = \box\voidbox
        \NewLineMessage{Output routine discards page \the\pageno,
            smaller than \string\FirstPageNo.}%
    \else
        \ifnum\pageno > \LastPageNo
            \setbox 255 = \box\voidbox
        \NewLineMessage{Output routine discards page \the\pageno,
            larger than \string\LastPageNo.}%
        \else
            \shipout\box255
        \fi
    \fi
    \global\advance\pageno by 1
}